March 28, 2024, 07:59:39 PM
Forum Rules: Read This Before Posting


Topic: got confused with PHR and weight ratio of polyurethane formulation  (Read 3685 times)

0 Members and 1 Guest are viewing this topic.

Offline jedizeus

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
i am asked about to making polyurethane foam with weight ratio, polyol (1) : MDI (1.1) with 0.5% of CNT filler.
Total weight is 220g.
0.5% of CNT = 1.1g, the remaining weight = 218.9g
weight of polyol= (1/2.1) x 218.9 = 104.24g
weight of MDI = (1.1/2.1) x 218.9 = 114.66g
But then our instructor ask us to do calculation in Part Per Hundred Resin( phr )
let the polyol = 100phr and MDI = 110phr,

my question is how to do calculate the phr of CNT filler?

Offline pgk

  • Chemist
  • Full Member
  • *
  • Posts: 892
  • Mole Snacks: +97/-24
Re: got confused with PHR and weight ratio of polyurethane formulation
« Reply #1 on: October 06, 2017, 08:35:46 AM »
Usually in industrial language, “phr of filler” refers to the mass percentage of filler per mass of pure resin.
But I cannot be sure, if your instructor means exactly that. So, ask him again.
« Last Edit: October 06, 2017, 10:11:35 AM by pgk »

Sponsored Links